초록 ▼

Process for dehydrating aliphatic alcohols admixed with water wherein the alcohols-water mixture is subjected to a first fractionation in the presence of a selective solvent, giving a vapor effluent containing dehydrated light alcohols and a liquid phase containing heavy alcohols, water and the sele

Process for dehydrating aliphatic alcohols admixed with water wherein the alcohols-water mixture is subjected to a first fractionation in the presence of a selective solvent, giving a vapor effluent containing dehydrated light alcohols and a liquid phase containing heavy alcohols, water and the selective solvent, said liquid phase being subjected to a second fractionation giving as vapor effluent an hetero-azeotropic mixture of water and heavy alcohols and, as liquid effluent, the selective solvent, which is fed back, said hetero-azeotropic mixture being condensed and separated into: (a) a light phase of high alcohol content which is subjected to a third fractionation giving a vapor effluent which is fed back and dehydrated heavy alcohols as liquid effluent, and (b) a heavy phase which is subjected to a fourth fractionation giving a vapor effluent which is fed back and water as liquid effluent.

대표청구항 ▼

A process for producing dehydrated aliphatic alcohols from a mixture of light and heavy aliphatic alcohols with water, comprising the following steps of: (a) introducing the alcohols - water mixture into a first fractionation zone at an intermediary point thereof, (b) introducing a selective solvent

A process for producing dehydrated aliphatic alcohols from a mixture of light and heavy aliphatic alcohols with water, comprising the following steps of: (a) introducing the alcohols - water mixture into a first fractionation zone at an intermediary point thereof, (b) introducing a selective solvent at a point of the first fractionation zone above the point of introduction of the mixture, (c) withdrawing at the top a vapor effluent containing the dehydrated light aliphatic alcohols, (d) withdrawing from the bottom a liquid phase of high selective solvent content and containing water and heavy alcohols, (e) introducing said liquid phase into a second fractionation zone, (f) withdrawing at the top of the second factionation zone a vapor effluent consisting of an heteroazeotropic mixture of water with heavy alcohols, (g) withdrawing from the bottom of the second fractionation zone a liquid phase consisting of the selective solvent freed to a large extent of water and feeding it back to step (b), (h) condensing the hetero-azeotropic mixture of step (f) into two liquid phases, a light phase of high alcohol content and a heavy phase of increased water content and separating these two phases (i) withdrawing the light phase obtained in step (h) and feeding at least a fraction thereof into a third fractionation zone, (j) withdrawing at the top of the third fractionation zone a vapor effluent and feeding it back to step(h), (k) withdrawing from the bottom of the third fractionation zone a liquid phase consisting of dehydrated heavy aliphatic alcohols, (l) withdrawing the heavy phase obtained in step (h) and introducing at least a portion thereof into a fourth fractionation zone, (m) withdrawing at the top of the fourth fractionation zone a vapor effluent and feeding it back to step (h), and (n) recovering from the bottom of the fourth fractionation zone a liquid phase consisting essentially of water,